64190993 has 2 divisors, whose sum is σ = 64190994. Its totient is φ = 64190992.

The previous prime is 64190989. The next prime is 64191013. The reversal of 64190993 is 39909146.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42354064 + 21836929 = 6508^2 + 4673^2 .

It is a cyclic number.

It is not a de Polignac number, because 64190993 - 2² = 64190989 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64190993.

It is not a weakly prime, because it can be changed into another prime (64190923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32095496 + 32095497.

It is an arithmetic number, because the mean of its divisors is an integer number (32095497).

Almost surely, 2^64190993 is an apocalyptic number.

It is an amenable number.

64190993 is a deficient number, since it is larger than the sum of its proper divisors (1).

64190993 is an equidigital number, since it uses as much as digits as its factorization.

64190993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52488, while the sum is 41.

The square root of 64190993 is about 8011.9281699226. The cubic root of 64190993 is about 400.3975069231.

The spelling of 64190993 in words is "sixty-four million, one hundred ninety thousand, nine hundred ninety-three".